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                  OF 9 |  |  PALACES, MOSQUES AND BAZAARS OF ISTANBUL  SULTAN AHMED MOSQUE (BLUE MOSQUE)  The 
              Mosque of Sultan Ahmet owes its name to Ahmet 1 (1603-1617). It 
              is without doubt the most beautiful masque of Istanbul. Travellers 
              call this magnificient structure the "Blue Masque" because 
              of the dominating blues of its interior. It was built across from 
              the St. Sophia as a rival in 1609-16 by Sedefkar Mehmet Aja, chief 
              architect of the Sultan. The Blue Masque has all the grace and delicate 
              lines that are representative of masques in the Ottoman capital. 
              St. Sophia, in its turn, is a grandiose expression, an imposing 
              and dark Byzantine work. In the Blue Masque, the architect Mehmet 
              Aja was inspired by the teachings of his master Koca Sinan and suppressed 
              all disunity between its three naves. We enter the Masque by any 
              one of three doors, the central one of which is the biggest. The 
              interior plan consists of a rectangle measuring 51.65 meters on 
              its longitudinal axis and 53.40 meters on its transversal. The central 
              cupola has a diameter of 22.20 meters and its height at its  Keystone 
              measures 43 meters. The dame rests on four broken arches on four 
              pendentives - these arches are topped by four spherical semi-domes 
              which have three smaller spherical squinches at their base, except 
              for the eastern side where there are only two. The four corners 
              of the masque support four small dames. The pillars, of 5-meter 
              diameters, are grooved and the fountains are built against the two 
              pillars closest ta the entrance. A gallery is supported on three 
              sides by short columns. All the walls, upto the main windows, are 
              ornamented with green and blue earthenware. The mihrab and the mimber 
              are in white marble from Marmara and are magnificiently sculptured. 
              The masque is lit by 260 windows.
 
               
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